Air humidifier



FIG. 1 is a perspective view of an air humidifier showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings depict portions of the air humidifier that form no part of the claimed design. 

CLAIM The ornamental design for an air humidifier, as shown and described. 